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Subsequent Events (Details)
12 Months Ended
Feb. 19, 2019
USD ($)
Feb. 08, 2019
USD ($)
Loan
Nov. 30, 2018
Subsidiary
Aug. 31, 2016
Subsidiary
Dec. 31, 2018
USD ($)
Subsidiary
Subsequent Event [Abstract]          
Number of wholly owned subsidiaries formed | Subsidiary     2 2 4
Credit Facility [Member]          
Subsequent Event [Abstract]          
Date of expiration         May 31, 2019
Credit facility current borrowing capacity         $ 170,000,000
Credit facility maximum borrowing capacity         $ 180,000,000
Subsequent Event [Member] | Credit Facility [Member]          
Subsequent Event [Abstract]          
Date of expiration Feb. 19, 2023        
Credit facility current borrowing capacity $ 145,000,000        
Credit facility maximum borrowing capacity $ 160,000,000        
Percentage of fee on unused portion of credit facility 0.50%        
Outstanding loan balance $ 50,000,000        
Number of days required to close the financing facility 30 days        
Events of degault, number of business days 3 days        
Subsequent Event [Member] | Term Loans [Member]          
Subsequent Event [Abstract]          
Number of term loans | Loan   6      
Aggregate principal amount   $ 44,310,000      
Subsequent Event [Member] | Term Loans [Member] | LIBOR [Member] | Minimum [Member]          
Subsequent Event [Abstract]          
Term of variable rate   30 days      
Subsequent Event [Member] | Term Loans [Member] | LIBOR [Member] | Maximum [Member]          
Subsequent Event [Abstract]          
Term of variable rate   3 months      
Subsequent Event [Member] | First Term Loan [Member]          
Subsequent Event [Abstract]          
Term loan maturity date   Oct. 31, 2020      
Subsequent Event [Member] | Last Term Loan [Member]          
Subsequent Event [Abstract]          
Term loan maturity date   May 31, 2025